How to achieve the perfect material for an aircraft glass canopy
Well let me say you that almost every jet has something called iridescence effect and you have tried hard to fake it but its ot a big deal to do  it you need to know that the effect of iridescence is created only in the border of the glass take for example this  and also the effect is minute in some angles but more visible in some , for the effect you need to use noise and hue saturation nodes. here is the setupand here is the result [3]
note if you want more colorful effect then reduce the factor of fresnel .also make sure to apply solidify modifiers to your glass . greetings !!!